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• FFmpeg for Android platform

  30 avril 2014, par Neeraj

  I am trying to create an android application that uses FFMpeg. For that, I downloaded the FFmpeg code(v 0.8.15) from http://www.ffmpeg.org/olddownload.html. And compiled the code as per instructions given at http://www.roman10.net/how-to-build-ffmpeg-for-android/

  As a result, .a files have been generated in Android/lib folder & .h files in android/include folder.

  But, when I try to create .so file of my Native code what uses this prebuilt FFmpeg library (.a files), it gives undefined reference errors.

  Please find my project’s code structure is given below.

  project path is /home/guest/Neeraj_temp/FFMpeg-Example

  At this path, I created two folders jni & prebuilt
  In prebuilt folder, I kept libavfilter.a, libavcodec.a, libavformat.a, libavutil.a, libswscale.a
  In jni folder, I kept one include folder that contains all .h folders (libavcodec, libavfilter, libavformat, libavutil, libswscale).

  api-example.c file is also kept in jni folder that uses FFmpeg’s APIs.
  & one Android.mk file in jni folder.

  Android.mk :-

  LOCAL_PATH:= $(call my-dir)
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE    := libFFmpeg
  
  LOCAL_C_INCLUDES := $(LOCAL_PATH)/FFMpeg/include
  
  LOCAL_SRC_FILES := api-example.c
  
  LOCAL_LDLIBS += -L$(LOCAL_PATH)/../prebuilt -lavfilter -lavutil -lavformat -lavcodec -lswscale
  
  include $(BUILD_SHARED_LIBRARY) 

  Error :

  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wavpack.c:689: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wavpack.o): In function `wv_unpack_stereo':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wavpack.c:604: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wavpack.c:608: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wavpack.o):/home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wavpack.c:1215: more undefined references to `av_log' follow
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wmavoice.o): In function `synth_block_fcb_acb':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:1359: undefined reference to `av_memcpy_backptr'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wmavoice.o): In function `synth_frame':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:1441: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wmavoice.o): In function `synth_superframe':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:1765: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wmavoice.o): In function `wmavoice_decode_packet':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:1919: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wmavoice.o): In function `wmavoice_decode_init':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:350: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:373: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wmavoice.o):/home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wmavoice.c:397: more undefined references to `av_log' follow
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(wnv1.o): In function `decode_frame':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/wnv1.c:81: undefined reference to `av_reverse'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(ws-snd1.o): In function `ws_snd_decode_frame':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/ws-snd1.c:70: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/ws-snd1.c:83: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/ws-snd1.c:79: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(xan.o): In function `xan_decode_frame':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/xan.c:568: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/xan.c:551: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(xan.o):/home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/xan.c:515: more undefined references to `av_log' follow
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(xan.o): In function `xan_unpack':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/xan.c:178: undefined reference to `av_memcpy_backptr'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(xl.o): In function `decode_frame':
  
  /home/guest/Neeraj_temp/ffmpeg-0.8.15/libavcodec/xl.c:60: undefined reference to `av_log'
  
  /home/guest/Neeraj_temp/FFMpeg-Example/jni/../prebuilt/libavcodec.a(xsubdec.o): In function `decode_frame'

  I have read a lot of blogs but still not able to get the solution. Kindly provide me the solution. How do I need to structure the code that I should not get these errors & get the code compiled.

  Thanks.

• javacv FFmpegFrameGrabber.start() blocked,not run next line

  23 août 2017, par L.U

  when i run grabber.start it blocked,not run next line.

  FFmpegFrameGrabber grabber = new  FFmpegFrameGrabber("rtsp://admin:123456@192.168.3.2:10554/tcp/av0_0");
  
  grabber.start();
  
  final AtomicBoolean interruptFlag = new AtomicBoolean(false);

  get console message :

  • [rtsp @ 00000000004ec600] CSeq 6 expected, 0
    received.
  • [rtsp @ 00000000004ec600] CSeq 6 expected, 0
    received.
  • [rtsp @ 00000000004ec600] CSeq 6 expected, 0
    received.
  • [rtsp @ 00000000004ec600] CSeq 6 expected, 0
    received.

  how to resole it ?thanks

• How to use IContainer with frame-by-frame data ?

  12 novembre 2014, par AnilJ

  We have implemented a video client where it captures N number of pictures (from web cam), encodes them and packs them as a block. This block is delivered to the decoder, which then initializes a new IContainer object each time with a buffer containing this received block.

  Although this design works well, by its design it introduces a time delay in the stream delivery. Since we are capturing N frames to build a block for delivery, the delay is N times the frame rate. Also we are not sure what is the cost (time) of creating and initializing IContainer object each time.

  To improve on this, we thinking of sending frame-by-frame encoded data to the receiver. However, creating new IContainer object in this case won’t work since it can not open/initialize with a P or B frame - It always requires an I-frame to initialize else open fails.

  Now my question is, how do we use the IContainer APIs for such a requirement ? We do not want to initialize/open the IContainer object each time. We want to know if it is possible to reuse the same IContainer object while we keep feeding it the received frames one by one in sequence. This way we completely avoid the source buffering as well as receiver buffering (we however will require a de-jitter buffer).

  We are using this APIs.
  http://www.xuggle.com/public/documentation/java/api/com/xuggle/xuggler/IContainer.html

  /anil.